基于卡门涡街原理的谐振型风力压电俘能器研究

针对大田环境中无线传感器网络节点需要持续稳定电能的要求，发展一种基于卡门涡街原理的谐振型风力压电俘能技术。基于计算流体力学数值方法，分析在不同风速下进气道内流场的流体动力学行为，实现对进气道及绕流体的结构设计。采用亥姆赫兹谐振腔作为风压谐振放大及涡脱频率的调节装置，并使谐振腔底部压电复合薄圆板与谐振腔的频率一致，从而在气流的冲击振荡作用下产生共振并输出最大的电能。实验表明，谐振型压电俘能器在风速14m/s，外部负载电阻400千欧时最大可输出13.6mW的电能。

Study on a Wind Piezoelectric Energy Harvesting Base on

A wind piezoelectric energy harvesting technique base on resonance and vortex street was developed to fit in with the needs of continual and steady electrical energy for wireless sensor network in the farmland. To design the air inlet and aerodynamic body, the fluid dynamics behaviors of the flow distribution subjected to different wind speeds in air inlet were analyzed using Computational Fluid Dynamics(CFD) numerical method. Helmholtz resonator was used for magnifying the wind pressure and vortex frequency. In order to generate maximum energy, the frequency of the piezoelectric composite circular plate was designed in accord with that of the Helmholtz resonator. The experiment results show that, for the case of wind speed 14m/s, the energy harvesting can generate the maximum energy 13.6mW with load resistance of 400kOmega?